Circuit-breaker device



ims mg mm E; DEAN CIRCUIT BREAKER DEVICE Fild Dec. 21. 1926 I INVENTORWILLIAM E. DEAN BY WM ATTOQNEY brakes released, so that in starting, thebrakes may still be applied, particularly at chamber 11" at onesidePatented Get, 11, i927.

wiLLiAr/in. DEAN, or EDGEWOD,=HBEHNSYLVANIAV Assreiv'oa To Tris; wnsrivsrrcnsnara BRAKE company, QE"NILMERDI1\TG, PENNSY VANIA, A CORPORATIONor v rnnnsynvanrn,

c nemaananas nnv'rcn.

Application filed December 21,1926. Serial No; 155,140.

This invention relates to. a device for open-mg the power circuit whenthe brakes automatically opening the power circuit- -when the brake pipepressure is reduced to effect an application oi the brakes. la- 1th.

the prior devices of this cliaracteigthe power circuit may be closedbefore the brake pipe has been adequately recharged and the the rear endof the train.

The principal object of my invention isto provide means for opening thepower circu t when the brakes are applied, in which the power circuit isheld open until the brake system has been substantially reel'iargedwithfluid under pressure.

In the accompanying drawing, the single figure is a diagrammatic view,partly in section, of an apparatus for opening the power circuit whenthe brakes are applied, and embodying my invention. 3

According to the drawing, this brake equipment may comprise a brakevalve device 1, a circuit breaker device 2, a circuit breaker controlvalve device 3, a feed valve device l, a main reservoir 5, and a brakepipe 6.

The brake valve device 1 may comprise acasing having a chamber 7containing a rotary valve 8, adapted to be operated by a handle 9. V V iThe circuit breaker device 2 may comprise a casing, containing a piston10, having a and a chamber 12} at the opposite side and having aseatring 13 on one side, adapted to seal against a gasket 14:, and a seatring 15 on the oppositeslde, adapted to seal against a seat 1 6, whenthe piston 10 is in the opposite position to that shown in the drawing.A small port 17 through the piston 10 connects chambers 11 and 12. I

Secured to the piston 10 is a piston rod 18 having a switch member 19 atits outer end, said switch member being adapted to be operated by thepiston 10 to open or close the motor circuit through contacts 20 and 21.The piston rod 18 extends through a chamber 22 containing a coil spring23 interposed between the casing wall 24 and the piston 10.

The control valve device 3. may comprise acasing containing a" piston25,; having a chamber 26' atv one: side, containing. a. coil spring 27acting on said: piston, and having a chamber 28 at the opposite'sideconnected through an opening 29 to a passage 30 inter-- posed in theusual feedvalvepipe 3132.'

Secured to the controlpiston 251by astem 36" is a valve 33 having afluted stem 34-, adapted to guide said valve inv the casing 3, and whensaid valve is open, the fluted stem- 332 permits communication between;passage 30 and passage and pipe 35; The stem 36 connecting the valve 33to; the piston 2-5 extends through the opening 29,. of; larger diameterthan the stem, so astopermit tree communication between chamber 28 andpas.- I

sage 30. a

In operation, fluidunder pressure iron the main reservoir 5 is suppliedthrouglii I pipe 36 to chamber 7 of the brake valve device 1, and.through pipe 37 to: the usual; teed valve devieed, which feedvalvedevice supplies fluid! at the standard. pressure to: be carried in: thebrake pipe, to pipe 31 and thence through. passage 30 and pipe 32 to theseat of the rotary valwe 8 ot the brake val ve device.

With the rotary valve 8'ini runningposition, as. shown in the drawing,fluid under pressure is supplied. to the. brake pipe 6, through cavity38. in the rotary valve.

The brake. pipe having beencharged' by flow from the feed valve deviceto the stand ard pressure for which the feed valve device is adjusted,the pressure of fluid supplied from the brake pipe 6 through pipe l0 tochamber 26 of the control valve device, will be the. same as thepressurelot fluid suppliedfrom. the feed val-vedevice lthrough passage30" to chamber 28-, so that fluid pressures on. opposite sidesof: piston25 are equal and the spring 27; operates on piston 25 to hold the valve33 seated.

If the brake pipe pressure he reduced, as by a train break-in-two, or byreason of a ruptured hose, the pressure in chamber 26 will likewise bereduced, and more rapidly than the pressure in pipe 32 is reduced byflow through the cavity 38 to the brake pipe. The higher pressure inchamber 28 then operates the piston 25 to open the valve 33, so as topermit fluid underpressure to be supplied from passage 30 to pipe 35which leads to piston chamber 11 of the power switch device 2. Theswitch piston is then shifted so as to move the switch member 19 outofengagement with the contacts 20 and 21, thus opening the powercircuit. When the brakes are being released, the

piston will be maintained in the position The switch piston 10 istherefore held in its position with the power circuit opened, so long asthe valve 33 is held unseated and the piston 25 will hold the valve 33unseated until the brake pipe pressure has been increased tosubstantially the full standard pressure carried. WVhen the brake pipe vpressure has been increased to substantially the standard pressure, thefluid pressures on opposite sides of the piston 25 become equal,

permitting'the spring 27 to operate the piston 25 so as to seat thevalve 33. The fluid under pressure in pipe 35 and chamber 11 thenescapes to the atmosphere through port 17 in piston 10, permitting thespring 23 to shift the piston 10 so that the switch member 19 againcloses the power circuit through the contacts 20 and 21.

It will thus be seen that I have provided. means for causing the powercircuit to be opened when the brake pipe pressure is reduced to effectan application of the brakes and in which the power circuit will not beclosed until the brake pipe pressure has been restored to substantiallythe standard pressure carried in the system.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is z 1. The combination with the brake pipe ofa fluid pressure brake system and a switch device for controlling thepower circuit of an electrically propelled vehicle, of means operatedupon a reduction in brake pipe pressure to apply the brakes foroperating said switch device to open the power circuit and means forpreventing the operastantially fully recharged with fluid underpressure. 1

2. The combination with the brake pipe of a fluid pressure brake systemand a switch device for controlling a power circuit, of a controllingvalve device, subject to the opposing pressures of the brake pipe andthe flow of fluid to recharge the brake pipe, and operated upon areduction in brake pipe pressure for operating said switch device toopen the power circuit.

3. The combination with the brake pipe of a fluid pressure brake systemand a switch device for controlling a power circuit, of a feed valvedevice for supplying fluid under pressure to the brake pipe and acontrolling valve device subject to the opposing pressures of the brakepipe and the pressure of fluid supplied from the feed valve device tothe brake pipe and operated upon'a reduction in brake pipe pressure foroperating said switch device to open the power circuit.

l. The combination with the brake pipe of a fluid pressure brake systemand a switch device operated by fluid under pressure for opening a powercircuit, of a feed valve device tor supplying fluid under pressure tothe brake pipe, a piston subject to the opposing pressures of the brakepipe and the pressure of fluid supplied from the feed valve device tothe brake pipe, and a valve operated by said piston for controlling thesupply of fluid under pressure to said switch device.

5. The combination with the brake pipe of a fluid pressure brake systemand a switch device operated by fluid under pressure for controlling apower circuit, of a feed valve device, a brake valve device forcontrolling the supply of fluid from the feed valve device to the brakepipe, a piston subject to the opposing pressures of the brake pipe andthe pressure of fluid flowing from the feed valve device to the brakepipe, and a valve operated by said piston for controlling the fluidpressure on said switch device.

In testimony whereof I have hereunto set my hand. 1

WILLIAM E. DEAN,

